SMAKN&reg; 2 Wire 0.28" DC 3.5~30V Mini Waterproof Dc Voltmeter Led Digital Display Voltmeter Gauge LED Voltage Detector Automatic Precision (BLUE) Product Name : Mini Digital Voltmeter;Measuring Voltage Range : DC 3.50-30V Display Size : 0.28";Display : Blue Overall Size (Approx) : 4 x 1.7 x 1.3cm/1.6" x 0.67" x 0.51"(L*W*T);Wire Lenght : 9cm/3.5" Color : Black, Red;Net Weight : 10g Package Content : 1 x Mini Digital Voltmeter